Rubber diffuser



FIG. 1 is a first perspective view of a rubber diffuser showing my design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The dashed or broken lines shown in the drawings depict portions of the rubber diffuser in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a rubber diffuser, as shown and described. 